Improvement in lock-nuts



ALMoN noEE, 0E soUTHPonT, CONNECTICUT.

IMPROVEMENT IN LOCK-NUTS.

Specification forming part of Letters Patent N 0. 88,908, dated April13, 1869.

To all whom 'it may concern Be it known that I, ALMON ROPE, ofSouthport, in the county of Fairfield and State of Connecticut, haveinvented a new and useful Improvement in Lock-Nuts 5 and I do herebydeclare that the following is a full, clear,'and exact descriptionthereof, which will enable others skilled in the art to make and use thesame, reference being had to the accompanyingdrawings, forming part ofthis specification, in which- Figures l, 2, and 3 are longitudinalsections of different modifications of my new arrangement of lock-nuts,showing them fitted upon screws. Figs. 4 and 5 are end views of thesame. Fig. 6 is a detail longitudinal section of two lock nuts puttogether.

Similar letters of reference indicate corresponding parts.

The object of this invention is to so arrange a system of nuts on screwsor bolts that when said nuts have been adjusted on the screws theycannot be displaced spontaneously by jarring or other motion.

he invention consists in the application to one screw of aright-and-left-hand nut working on separate corresponding` threads, orof one nut and one screw working in opposite directions, and ofset-screws for lookin g the nuts together when they are adjusted.

hen two nuts, or a nut and screw, working in opposite `directions are soconnected that they cannot be separately turned, it is evident that theycannot be moved in either direction, and that they are therefore firmlylocked to the screw.

In order to mount two nuts, A and B,which have their threads cut indi'erent directions, as shown in Fig. 6, upon one single shaft, C, andclose together, the shaft must have corresponding threads cut 011 it.This can be done, as in Fig. l, by having a right-hand thread, a., cuton the shaft, to receive the nut A, and a left-hand thread, b, on theouter part, to receive the nut B.

To allow the nut'A to pass over the part b, the thread a must continuethrough that portion where the thread b is cut, and therefore a doublethread, a b, is cut on the shaft, the lines crossing each other, as inFig. l.

.hen the nut A has been screwed to the requisite close against A, asshown.

place the nut B is applied and screwed Set-screws c c, arranged in theedges of one or both of the nuts A B, are now turned down so that theirheads lap over the edges of both nuts at once, as shown in Fig. l.

The nuts, being` prismatic, cannot be turned separately, as the heads ofc lock them together, and they cannot be'turned jointly, as their headsare cut in opposite directions.

When the threads a. b are not to be crossed, as in Fig. l, the outerthread, b, may be cuton a smaller portion of the shaft C', as in Fig. 2,to receive a nut, B', with a smaller bore than the nut A', which isscrewed upon the larger part a of the shaft. The size of the two nutsshould, however, correspond, as in Fig. 2, sc that they may be locked bythe screw c c, as in Fig. 2. The threads a b are, iu the latter case,also in opposite directions, as shown.

Substantially the same invention may be applied by using the lint A2 anda screw, B2, on a shaft, C2, as in Figs. 3 and 5.

The nut A2 has its thread so arranged, in conjunction with the thread cton C2, that it is turned in the opposite direction to that in which thescrew B2 is turned when applied.

The screw B2 is fitted into a female thread b, provided in the end ofthe shaft 02, as shown.

The head d of the screw B2 should be as long as the nut A2 is wide, sothat it may reach to the edges of the same, tobe locked by the setscrewsc, in the manner substantially shown in Figs. 3 and 5. Y

It is evident that the parts A2 B2 cannot be turned in eith erdirection, separately or jointly, when locked by the screws c, in themanner shown.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. Providing a shaft, C, with double thread ct and b, crossing eachother, as shown in Fig. l, to allow a right-hand 'nut to pass over athread adapted to a left hand nut, and vice versa, as specified.

2. The combination of the screws c with the nuts A B and screw-shaft C,substantially as described, for the purpose specied.

ALMON BOFF.

